1021120120999 has 16 divisors (see below), whose sum is σ = 1129599563040. Its totient is φ = 915257871360.

The previous prime is 1021120120967. The next prime is 1021120121009. The reversal of 1021120120999 is 9990210211201.

It is a cyclic number.

It is not a de Polignac number, because 1021120120999 - 2⁵ = 1021120120967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021120120499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2117359 + ... + 2554495.

It is an arithmetic number, because the mean of its divisors is an integer number (70599972690).

Almost surely, 2^{1021120120999} is an apocalyptic number.

1021120120999 is a deficient number, since it is larger than the sum of its proper divisors (108479442041).

1021120120999 is a wasteful number, since it uses less digits than its factorization.

1021120120999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440130.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 1021120120999 in words is "one trillion, twenty-one billion, one hundred twenty million, one hundred twenty thousand, nine hundred ninety-nine".